Enhance the code comprehension ability of zls through the zig compilation system.

[sdzx-1]

Zig's code supports compile-time calculations. Complex types are difficult to get results through syntax analysis. Only the Zig compiler can understand its code most accurately. Does ZLS plan to use the Zig compiler code to analyze the code? Here is a Haskell example:
https://ndmitchell.com/downloads/paper-building_an_ide_on_top_of_a_build_system_revised-04_sep_2020.pdf

Maybe zls can also try this.

[leecannon]

This is tracked by #2017